1919] HORTICULTURE. 247 



Tangelos: What they are. — The value in Florida of the Sampson and 

 Thornton tangelos, \Y. T. Swingle and T. EL Robinson ( U. 8. Dept. Agr., Bur. 

 Plant Indus., 1918, pp. 3). — The tangelos described In this document originated 

 as the result of crosses made by the Department of Agriculture between the 

 tangerine orange and the grapefruit. The two varieties here described have 

 been grown in a small way only and, until recently, chiefly for home use. In 

 view of the present tendency to make commercial plantings of tangelos in 

 Florida, special attention is called to the characteristics of these two types 

 and precautions necessary for producing fruit of good quality. The success of 

 these first two hybrids has led to the creation of hundreds of additional hybrids 

 between all the Mandarin types of orange, including several varieties of tange- 

 rines, the King and Satsunia oranges, and the better types of grapefruit and 

 pummelo. The resulting tangelos are now being tested out. 



The authors state that for the canker-infested portions of the Gulf Coast 

 States west of Florida there is reason to believe that some of these tangelos 

 will be found of marked canker resistance. The Natsu-mikan, a fruit similar 

 to the tangelo and possibly a spontaneous hybrid of an orange of the Mandarin 

 type with a Japanese pummelo, seems to be decidedly canker resistant, both 

 in Japan and in this country. Furthermore, some of the tangelos developed 

 by the Department have been practically canker resistant as tested at the 

 Philippine College of Agriculture. Hybrids between canker-resistant pummelos 

 and other citrus fruits made in Japan in 1915 and in subsequent years are being 

 tested for canker resistance, both in Japan and in the Philippine Islands. 



Questions on frozen citrus fruits and trees, H. J. Webber and C. S. Mnxi- 

 ken (Cal. Citrogr., 4 (1919), No. 4, pp. 78, 99, 101, 103, figs. 3).— This paper 

 contains information on the effects of freezing on fruits and trees, based on an 

 investigation conducted by the members of the staff of the California Citrus 

 Experiment Station after the freeze of 1913. 



Coconut cultivation and plantation machinery, H. L. Coghlan and J. W. 

 Hinchley [London: Crosby Lockwood & Son, 1917, 2. ed., pp. XII +128, pis. 10, 

 figs. 7).— This work deals with the culture of coconuts, with special reference 

 to Malayan conditions. The successive chapters discuss soil and climatic con- 

 ditions, preparation of the land, seed nuts and cultural operations, pests, man- 

 agement of the crop, copra, coir, estimates of costs and profits from the coconut 

 and coconut products, machinery and plant for coconut factories, and catch 

 crops. A supplementary article briefly discusses various phases of the coconut 

 industry in the West Indies. General information and plantation tables are 

 appended. 



Medicinal herbs, J. Chappell (Jour. Roy. Agr. Soc. England, 78 (1917), pp. 

 72-84)- — A descriptive account of various classes of medicinal herbs, including 

 methods of gathering and preparing the different parts of the plants for 

 market. • 



How to propagate bedding plants by cuttings, T. J. Shewabd (Gard. 

 Chron. Amer., 23 (1919), No. 2, pp. 46, 47. figs. 68).— A plate with descriptive 

 text is given illustrating a large number of bedding plants and methods of 

 propagating them. 



The ideal farm greenhouse, C. Jensen (Olcla. Agr. Col., Ext. Div. Circ. 83 

 (1918), pp. 4. fiffs. 7). — This circular contains directions with plans and illustra- 

 tions for constructing a greenhouse from standard size 3 by 6 ft. hotbed sash. 



Beautifying the home grounds, C. Jensen (Okla. Agr. Col., Ext. Div. Circ. 

 85 (1919), pp. 7, figs. 3). — This circular contains suggestions relative to laying 

 out and planting the home grounds, including a list of planting material adapted 

 to Oklahoma conditions. The text is accompanied by plans of farmstead and 

 town lots. 



